But
$that : Thing(...)
Thing( this != $that,...)
is the standard way of ensuring that a pattern matches two distinct objects of the same class, and there is no reason why you shouldn't be able to use it with not as well:
$that : Thing(...)
not ( Thing( this != $that,... ) )
"Given one Thing (with constraints...) and *not* having any *other* Thing (with constraints...), then..."
-W
Hi,
I’m new to Drools and currently trying to implement some examples using CEP / Fusion. I got stuck on a problem to which I can’t find any solution in the online documentation, so I’m hoping for your help.
I’m trying to write a rule, which is activated whenever a certain event occurs and no event of the same type occurred in the e.g. last 5 minutes (or just at the same time). I know how to do it if these are events of different types, but I can’t find any way for events of the same type. What I tried is something like that:
$error : RouterErrorEvent ( $name : routerName ) from entry-point "abc"
not ($otherError : RouterErrorEvent ( (this coincides $error) && (routerName == $name) ) from entry-point "abc")
First of all there’s the problem, that $error and $otherError will be the same instance if a “RouterEventError” has been inserted from the “abc” entry point. Adding a (this != $error) to the second, ($otherError) obviously is no solution to that as well.
If it were two different events something like in example 2.19 would work:
$error1 : ErrorOneEvent( $id : id )
not ($error2 : ErrorTwoEvent( id == $id, this coincides $error1 ))
I’m kinda sure I’m missing something pretty “easy” here… or is this approach completely wrong?
As I’m aware of the fact that I couldn’t be more of a newbie J I would appreciate any suggestions for nice tutorials or further reading as well!
Thanks in advance!
Georg
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